function showIsbn() {
	var isbn = document.getElementById("isbn");
	var title = document.getElementById("title");
	var author = document.getElementById("author");
	var publisher = document.getElementById("publisher");
	var date = document.getElementById("date");
	var category = document.getElementById("category");
	isbn.style.display = "table-row";
	title.style.display = "none";
	author.style.display = "none";
	publisher.style.display = "none";
	date.style.display = "none";
	category.style.display = "none";
}

function showCondition() {
	var isbn = document.getElementById("isbn");
	var title = document.getElementById("title");
	var author = document.getElementById("author");
	var publisher = document.getElementById("publisher");
	var date = document.getElementById("date");
	var category = document.getElementById("category");
	isbn.style.display = "none";
	title.style.display = "table-row";
	author.style.display = "table-row";
	publisher.style.display = "table-row";
	date.style.display = "table-row";
	category.style.display = "table-row";
}